<template>
	<div>
		<h1>当前求和为：{{$store.state.sum}}</h1>
		<!-- <h3>当前求和放大10倍为：{{$store.getters.bigSum}}</h3> -->
		<!-- 简写 -->
		<h3 style="color:red">personList的长度为：{{personList.length}}</h3>
		<h3>我在{{school}}，学习{{subject}}</h3>
		<select v-model.number="n">
			<option value="1">1</option>
			<option value="2">2</option>
			<option value="3">3</option>
		</select>
		<button @click="increment(n)">+</button>
		<button @click="decrement(n)">-</button>
		<button @click="incrementOdd(n)">当前求和为奇数再加</button>
		<button @click="incrementWait(n)">等一等再加</button>
	</div>
</template>

<script>
    import {mapState,mapGetters, mapMutations,mapActions} from 'vuex'
	export default {
		name:'Count',
		data() {
			return {
				n:1, //用户选择的数字
			}
		},
    	computed: {
			/* 	程序员自己写
			school(){
				return this.$store.state.school
			},
			subject(){
				return this.$store.state.subject
			},
			bigSum(){
				return this.$store.getters.bigSum
			}
			*/
			//借助mapState生成计算属性：sum、school、subject（对象写法）
            ...mapState({sum:'sum',school:'school',subject:'subject',personList:'personList'}),
			//借助mapGetters生成计算属性：bigSum（对象写法）
            ...mapGetters({bigSum:'bigSum'})
		}, 
		methods: {
			/* 	程序员自己写
			increment(){
				this.$store.commit('JIA',this.n)
			},
			decrement(){
				this.$store.commit('JIAN',this.n)
			},
			incrementOdd(){
				this.$store.dispatch('jiaOdd',this.n)
			},
			incrementWait(){
				this.$store.dispatch('jiaWait',this.n)
			},
			*/
			// mapActions与mapMutations使用时，若需要传递参数需要：在模板中绑定事件时传递好参数，否则默认传递参数是事件对象(event)。
			//借助mapMutations生成对应的方法，方法中会调用commit去联系mutations(对象写法)
            ...mapMutations({increment:'JIA',decrement:'JIAN'}),
			//借助mapActions生成对应的方法，方法中会调用dispatch去联系actions(对象写法)
            ...mapActions({incrementOdd:'jiaOdd',incrementWait:'jiaWait'})
		},
		mounted() {
			console.log('Count',this)
		},
	}
</script>

<style lang="css">
	button{
		margin-left: 5px;
	}
</style>
